Zobrazeno 1 - 10
of 40
pro vyhledávání: '"Ganguly, Chandrima"'
Autor:
Moats, David, Ganguly, Chandrima
This commentary piece reviews the recent Open AI Democratic Inputs programme, which funded 10 teams to design procedures for public participation in generative AI. While applauding the technical innovations in these projects, we identify several shar
Externí odkaz:
http://arxiv.org/abs/2407.11613
Autor:
Ganguly, Chandrima, Quintin, Jerome
Publikováno v:
Phys. Rev. D 105, 023532 (2022)
It has been known that a non-perfect fluid that accounts for dissipative viscous effects can evade a highly anisotropic chaotic mixmaster approach to a singularity. Viscosity is often simply parameterised in this context, so it remains unclear whethe
Externí odkaz:
http://arxiv.org/abs/2109.11701
Autor:
Ganguly, Chandrima
A cosmic no-hair theorem for all initially contracting, spatially homogeneous, orthogonal Bianchi Cosmologies is derived - which shows that all such Universes asymptote to a spatially flat, isotropic Universe with the inclusion of a shear viscous str
Externí odkaz:
http://arxiv.org/abs/2008.02286
Autor:
Ganguly, Chandrima
Standard models of cosmology use inflation as a mechanism to resolve the isotropy and homogeneity problem of the universe as well as the flatness problem. However, due to various well known problems with the inflationary paradigm, there has been an o
Externí odkaz:
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.753398
Autor:
Ganguly, Chandrima, Bruni, Marco
Publikováno v:
Phys. Rev. Lett. 123, 201301 (2019)
A Bianchi IX Mixmaster spacetime is the most general spatially homogeneous solution of Einstein's equations and it can represent the space-averaged Universe. We introduce two novel mechanisms resulting in a Mixmaster Universe with non-singular bounce
Externí odkaz:
http://arxiv.org/abs/1902.06356
We consider the robustness of small-field inflation in the presence of scalar field inhomogeneities. Previous numerical work has shown that if the scalar potential is flat only over a narrow interval, such as in commonly considered inflection-point m
Externí odkaz:
http://arxiv.org/abs/1803.00625
Autor:
Ganguly, Chandrima, Barrow, John D.
Publikováno v:
Phys. Rev. D 96, 123534 (2017)
We study a model of a cyclic, spatially homogeneous, anisotropic 'mixmaster' universe of Bianchi type IX, containing a radiation field with non-comoving ('tilted' with respect to the tetrad frame of reference) velocities and vorticity. We employ a co
Externí odkaz:
http://arxiv.org/abs/1710.00747
Autor:
Barrow, John D., Ganguly, Chandrima
Publikováno v:
Int. J. Mod. Phys. D 26, 1743016 (2017)
What happens to the most general closed oscillating universes in general relativity? We sketch the development of interest in cyclic universes from the early work of Friedmann and Tolman to modern variations introduced by the presence of a cosmologic
Externí odkaz:
http://arxiv.org/abs/1705.06647
Autor:
Barrow, John D., Ganguly, Chandrima
Publikováno v:
Phys. Rev. D 95, 083515 (2017)
We investigate the behaviour of bouncing Bianchi type IX `Mixmaster' universes in general relativity. This generalises all previous studies of the cyclic behaviour of closed spatially homogeneous universes with and without entropy increase. We determ
Externí odkaz:
http://arxiv.org/abs/1703.05969
Autor:
Barrow, John D., Ganguly, Chandrima
Publikováno v:
Classical & Quantum Grav. 33, 125004 (2016)
We study the behaviour of Bianchi class A universes containing an ultra-stiff isotropic ghost field and a fluid with anisotropic pressures which is also ultra-stiff on the average. This allows us to investigate whether cyclic universe scenarios, like
Externí odkaz:
http://arxiv.org/abs/1510.01095